Received: from localhost (unknown [200.46.204.183]) by mail.postgresql.org (Postfix) with ESMTP id D7A7D64FEFB for ; Tue, 2 Dec 2008 05:22:49 -0400 (AST) Received: from mail.postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 03325-01 for ; Tue, 2 Dec 2008 05:22:46 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mx.inode.at (mx07.lb01.inode.at [62.99.145.7]) by mail.postgresql.org (Postfix) with ESMTP id A543964FEDF for ; Tue, 2 Dec 2008 05:22:46 -0400 (AST) Received: from [85.124.56.44] (port=6234 helo=[10.192.17.33]) by smartmx-07.inode.at with esmtp (Exim 4.50) id 1L7RSt-0002dM-0T for pgsql-performance@postgresql.org; Tue, 02 Dec 2008 10:22:43 +0100 Message-ID: <4934FE60.30702@sime.com> Date: Tue, 02 Dec 2008 10:22:40 +0100 From: Mario Weilguni User-Agent: Thunderbird 2.0.0.18 (X11/20081125) MIME-Version: 1.0 To: pgsql-performance@postgresql.org Subject: Experience with HP Smart Array P400 and SATA drives? Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 8bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200812/5 X-Sequence-Number: 32041 Has anyone benchmarked this controller (PCIe/4x, 512 MB BBC)? We try to use it with 8x SATA 1TB drives in RAID-5 mode under Linux, and measure strange values. An individual drive is capable of delivering 91 MB/sec sequential read performance, and we get values ~102MB/sec out of a 8-drive RAID5, seems to be ridiculous slow. Write performance seems to be much better, ~300 MB /sec - seems ok to me. I guess I must be doing something wrong, I cannot believe that a 500 ¤ controller is delivering such poor performance.